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OM-2031
TROUBLE, SYMPTOM
AND CONDITION
GENERATOR CONTROLS AND INSTRUMENTS (CONTINUED)
2. No (or low) output
voltage when operating
in MANUAL mode
(Continued)
NO. 1 LOAD CONTACTOR OPERATING CIRCUIT
2. Load contactor (K1)
will not close when
control switch (20,
Fig. 1) is held in
ON position. Generator
running at
normal voltage. No
fault lights on.
3-1
Page 20
PROBABLE CAUSE
B. Defect in manual voltage
control portion
of excitation circuit
(1) Defective AUTO-
MANUAL switch (33,
Fig. 1)
(2) Defective rectifier
(CR 3) (Sect
1-1; 14, Fig. 7)
(3) Defective resistor
(R11) (See,
Fig. 2)
(4) Defective rheostat
(R61) (32,
Fig. 1)
A. In addition to defective
wiring and
connections in the AC
and DC load contactor
actuating circuits,
the load contactor
may be prevented from
closing for any one
of the following
reasons:
(1) Blown fuse (F1)
Trouble Shooting Chart (Sheet 12 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
A. Check as follows:
(1) Check contacts and oper-
ation of AUTO-MANUAL
switch. Replace if de-
fective.
(2) Jumper resistor (1, Fig.
2). If normal voltage
(depending on rheostat
setting) is produced,
replace resistor.
(3) Jumper resistor (1, Fig.
2). If normal voltage
(depending on rheostat
setting) is produced,
replace resistor.
(4) Connect a jumper across
rheostat. If maximum
(manual control) voltage
is produced, replace
rheostat.
A. After checking fuse (F1) in
step (1) below, check all
wiring and connections in
the load contactor circuits
on the engine control panel,
protective relay tray, and
power module. Then check
components as follows:
(1) Remove and inspect fuse.
August 5/89 Revised
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